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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fac01264e9ba2c1913ecb05b57961dfcf75ab00ddded5d8919b1b42b3d4b3a01' 
  AND token = 'Ab/Er9NN4LFOAE0n2ch52nIXmMda1EcicOkpzeeCDoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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