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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44a00dca67bb663a598d81c9ebbf4ebba8709420e9606e0c61c611fd6723c71e' 
  AND token = 'GaAa1mXLI5Sb/wymPGDNcfqkdISgQz5Qyt85IfWTDQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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