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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90ffa08dcca4bc1d30f9cc6480451cc23ace4a252a6df2e4c2f36488d26826cc' 
  AND token = 'FUbZ3OHzQ5r3KtJ3bDuV+67BaMJ0mXwkg4laZx88eNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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