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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea46e1cb392c0ac3503aca242176c12ad5870c6a29030d52620f7903d11d80f2' 
  AND token = 'r8Jlyj4meXGGpH2T0KT9lRyhm+N0vdfNEVw64PYfG5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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