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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b081bdb7338f72500c7ba0ba991003681be439eeb0721977ebf1666e668c2653' 
  AND token = 'iznQIvKw3DfHa49ZjuZmQbaLLUQNg/Hy7mWXbwpr1F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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