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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '956e3fb51c0c4a8ae5e07d1e2ed7da6d3dce57dacb25e1443ef897507a15671b' 
  AND token = 'esvdLbhLowsVkJ4NhVY8PBbv6+Zei1s+VqhvNQrPZKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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