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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed3d415f299ea782e833573b165d5227ce429421e58735588ecaf0dbf7cd8440' 
  AND token = '2EoxQv/6Eq4vJ2WS+UIlEAGAwoMT1c7j68qh63Re5ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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