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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5434951da0966b699eef23db6c12d437dfad9abf0db54cc41abd961b58b45011' 
  AND token = 'XaFW1ovmL1avTC7dtM3Nx3rDDkfVTKbV1+3KRy42lg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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