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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1aea1ee8c01f6744e9966c431212e8dea4c29bf3f30cc9d6639e15690c34290' 
  AND token = 'pv4porlyNb91+z0E1M2vRB3cNl8o2upJYF2Tltvs+/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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