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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e416c286d0fe1fd767d9f622e591783dc703acff41e413d7796de39b333526c' 
  AND token = 'xH2/p8e1Dd0sXYi3lhCBMIedrBAaUyKwfODQ8CRp+G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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