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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3d08c59242cae7537630bea7a34baf8f186ee8a755e35c1be3a7c58de910387' 
  AND token = 'Rzo8e/8l+ROuqIZS1CJ9EQOWymfRvH4URVQ86z6OOO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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