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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52ef6858480f7d51e71abcfc1080a8c081ad18e8acd796133883c94dae806fa5' 
  AND token = '3Io5rpD95KpRZr0GyHy335yhxHOkUp1cZgLdWxpCRV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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