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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e0446ad0aa68bdfb7b345874f5d0af5af858eee9f8ca0e05ce1f850e0e1d73' 
  AND token = 'ifeHILYGBXfZRcwMK2N3rf9XuqtMZAeDNrl0JrU8sAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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