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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf5519f5b0dc1d99da65dfb7001e3e7b4b738955f762de7c18a0790ed9c73b21' 
  AND token = 'hGbtsoN3a8rJlMo9eUuJXDO7Yy18jRh3SAU8E53bCKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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