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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c4b73f25f6c0f6601f2fa5f1c6cf6d5277c3417709b536d7b705adaa1cc66af' 
  AND token = 'dBR7brORakkPvFWgGFZObyRMAIhmzTtUQpXQG76ihDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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