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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fac1bfafe6d993fcf3d45566e053c7072d88ac7a73d104a829237a1f5f499a8' 
  AND token = 'qz97OrQtRqrQmelBaO5S4V+ciflzu44PvVHOj1YJRTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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