SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d15e965b838fca53a2db6bcfc742451089db24db57facd2d26ffe5ce3e77838' 
  AND token = 'F+Z5YWLAPhE9QsXMECSvhWLYcNQCyJjTr1gt98qKYKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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