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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd7d11bcabb2c5f825df2cad982d1788bf3560bd439b08257fe7bf0af99c7106' 
  AND token = 'b5SFlZMyHNglxOFfAgB9NN5jfXvvy4hvuvGkVoQ3Fgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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