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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0ca62a4b47f455fd39afc243f59735f11882a76f73d5358601c8fdf2da49414' 
  AND token = '6Thca26y0djSaSdwu5sluwdzwi51nUjPdlYVkhlc9cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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