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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91046f243af14b9c83eb29297b1e3b22e3258ff74f74b41c3a41f2e5d389151e' 
  AND token = 'f7L5gIjq4Tkl7joFG0MreReswi4TMfk9JLzQuxNJXKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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