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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00f26a6a80295d7365b4e5bdde10d1614da47f9e841bde953ab3d10af6f5f618' 
  AND token = 'LZX1HBxHO0uXj1FLVN6y9hItIz6a5dbqM7ONFexfbeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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