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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a06b6d44eff67e78883b8f8988e9f669f94c3f6cf569a208eb51b4ba4574fac1' 
  AND token = 'yOEClNPisvjO0tX11pO3Ra4OvonIGTM7UvaBC6Ykad0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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