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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57fb6a9641fc593b8ab9faba578aeb9d8d0bd9e8165346c6c9216d32f58fdc4c' 
  AND token = 'zLLoiCBA1a5vGfFmQFAAjBwFGcBxkhs85bYGdS65crY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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