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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2146107504a2604cbc13db18dc81be173b08035398c460220c5d1cc21542ad28' 
  AND token = '9Odz+BVHRJzT8yKZyA4zc6D1mjNXmfD7ReSnsYRMOXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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