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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36f3dc4100151e8b24cf742974731bea34438b9a0d80709a4fc2dc3e08754c5a' 
  AND token = 'pfi/6fqFGsqUxxiISXm4KBR4qVtfl3ivZu54iT/PTek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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