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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16bda9c6881f25e914782ac888e5a1b371686cd668ec82775f92f04cc82ad028' 
  AND token = 'Yp9dKqHJm8BYpq2hdg9gpr4zXG/TlCd49db3GAJTpr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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