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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5afee917ee5e125eb5074319011da94bdbb25f4669b75e6ce5c15d1a51d7cfdb' 
  AND token = '6MnsAOgyVUKJivUW9lrK7BlFWpj+Hku7fA/laW1JVE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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