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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e1be58559ee037139c962c301fd996833d104e5d3a79bbd606d6465e15c9849' 
  AND token = 'bQdQ4tVlUuEunEC9cR+L1QdMRKnwduyARfxx8L7klNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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