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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c48b780cfcec6ad0633f5cef1186378645cee2b0b90068fcf756e066749be57' 
  AND token = 'b44HVSKXkSmIuZ6aCx/AKvhDY9l9ir6WVWAOXreCBfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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