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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b8f4838a143c8d21a03fca429cbe4ba52af1053aa61606922eafe5f49e350f8' 
  AND token = 'Npau9VfP5dX98y/hlfFJuPvYGS0fxsK/IdDsLOUAhhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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