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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aad2d29ac50beb5b48b35b1d41d1bbd2414ad0389dbe4653ab2e4825d2763217' 
  AND token = '+NpvP4L4nZqJ48jpqJ94vTmLMsIf4jeQ2tArN0TAf4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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