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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cec6a1c9b36bfdef8ba098f7ec6f9fa03608e8b7c2b9ac88874dbc05e18b97c' 
  AND token = 'it4c//oCJWB/HQlFPu/6VqsGF/kA9ovTyQOwwr6bUAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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