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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f776bb4e5cb4fb4354b253aefbcc26ad78c94f1f16d956627eb55a38508023a' 
  AND token = 'Z6GLt5b2YMzHayegpO35XmR1GAjMVSuMIRGc2KIyv2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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