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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d68db401d53ba0a4b2e8bf834c17193e35287461eb2d4b132bba75cec25c4e6' 
  AND token = '88DLi5lB5ByCHL9DcXsjnOrwNKmJtUgv+AuKH2t8G5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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