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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '847c53b330a3a773b679bf21bd37743a8d3752936b7dd9a8771d7a1c235c9662' 
  AND token = 'z+aS+vKXsSU38JkGsrinOKL7Gxx0EADn+Y3ujY3ruOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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