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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fdf575d71ab0a194e2abaad72b3ba34838431351551e97c53f4f085f85958d0' 
  AND token = 'gs9Mn1OtHzLNKnGCPPyJWNLF0CMDu5DlqZK4ursy6AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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