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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62c84ee9674205faac2b9b1f0aff64d09ad1f0acd88b89896a2ee773b8d744a2' 
  AND token = 'fvbF/oieK7eBZklqJLVtZUCug4fbeqD2bwrgqaIBrJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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