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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '614f55af2122171bcdc14a6428c7d0105d326d8d2483adbf34a0a8620072162e' 
  AND token = 'pC2Hy7dmFk4XPN+FGMkO98LrjsNmTg49In2GtsobVJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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