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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f82bf10c9880bb128150b205c4e4d554421327166f70b610d31b92aa505afc91' 
  AND token = '5842Y3O19PjtbGl20e+TN8wzsc0DkjO1d0v1QKZq9FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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