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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a97107a134d56175b08b90c4b897f9680f82738f5619b3b555946f9a016929ce' 
  AND token = '8t3KuP+9reuT0cfcP8+nIOqSgS6SyRonNrAprtGdRns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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