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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b86aeae138745289a6a082b171933f7e1b4c1d2a60fd3c1494c1316e6a080ac' 
  AND token = 'wnnQsRZJRJvianyedJG0JK72imRA60MjQlK1JrRd7tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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