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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36d2c4b8703607385219192189ccad44703b2f74d8136ce3f955144b6b482c42' 
  AND token = 'Ob8uWRnh8vN5LlQgo6BKtyGGTLWHs3pOGtK3A9y20uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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