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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '682335489c55b74713f26d350d7dba0605f5cb417f7fa1701836f896ef2d4dd7' 
  AND token = '0/TOxMWDFNhAiHNljPQgqbMe5djiXtRr0y+Cqa7O5QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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