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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '191397a02dabf1b598223ed176063249c596727dbb968561659e2e8f359e5e2d' 
  AND token = 'TtZzTmKvyL7i16jNnnonmkR8rD79tdYc1IXr0KL32Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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