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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae1f48909cc773ca336ea20f68866981d92ed04bd5fdf0fafbbe7e1099b0351e' 
  AND token = '1OIy+9Hn9IgBSNfa/NtXVmEKFy3cUD7xPiChVB9aKEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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