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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e175daac8bead80ad78c68c72725d68bee2452e682c65a29afc423c02792081d' 
  AND token = 'yb5kETd84NXba2egTNkRKxG72dtpXkER+HDB0Vjt1es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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