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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb9ae0bf720040aa909aac5db699e6fc3d54234e51a232ce9b3a026dabb3a662' 
  AND token = '9OSYPSeDf8Nrs/z/KoTk6w0O2OUQKHcgdVmaT1YXWZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}