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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0328b490abdc111633adc3d9770ad6abc39aef9fa601a1e68dec0e29edb435c' 
  AND token = 'yf78gmBPeyAjq0rZQ9O2CKKlhl2gniHQXL+7kC8lYME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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