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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9db3ca5e1d05ed258d5d6a89abc6edc55dc3f34d2e0384bca448a30fe3507b4' 
  AND token = 'HdA9teOYK/51rWJh6oMsdhX7yLS7pDHiUkMVCPqQZuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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