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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '003a39189f31b4adcc3f9fb534e4f227a2dffce5babc6a90d16560da1b72c445' 
  AND token = '/mjeHR6P2LN3sWgVucLQSWet55ixdV64Wuf2IGWtULE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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