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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '619eefa6e3a5998e45894e3b0d6b0a631f510fef5a4d136b9a69108ceea9984f' 
  AND token = 'ozfskLdJflCkdlBY4aYmCOUFc6KCtEi2uFn1rgD4Z3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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