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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f5c00bb0b595424f5e1ad3b1c489e90af399ecdf3196fe47d9d34ae6e310a1e' 
  AND token = 'AqeUZrWwlqQvkiubadzCKMrugG2rhIi/gm3bUVzIWt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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