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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e82781bc64318914081d8d76bb6821dc17e21cc18373ec26a908131603810af' 
  AND token = 'G2jb/UWuUyZybZibMXWozGd/XQWun7WJC+ml0vroc6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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