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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6da5d29029a0d1030f6c0c03a8dcacff360854b0798530618b26faa48f321945' 
  AND token = '/H9x1w6EZ0gGQc5MYdaclBczSVGjI0ECq1BdbN0eSoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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