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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03ea63fd10aae31ae81b074a62b4c063cb73373bf59764735bb028c3ee2f0105' 
  AND token = 'S74pwlPPZ7XCe+/m4e6lNO5NxMRrkHsJedjZYA+TYdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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