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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f7530ee41edb671db7f07b8d081ec961f203d50c86c2f5d95afb61f26f5d537' 
  AND token = 'ayMo3o8N3ixWOl/o5MmieZBAN2iNYmrm8NkU/+lL8lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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