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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6af8031ce630745da4ac56d2a3eef4dd41a9ee854925c6931f3e77ccbf2c3f7e' 
  AND token = '5XMjx0o0fJOCNX2YnaWoVSXvAjxoV1hrHx+d+rfzSf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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