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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e70c69fb37258268aec10127f8782db41afda452d8aa50385095e4c6c77f508' 
  AND token = 'zfwMtrGTWPH1OylxNafKe3PzJQMvG0b9JhF8gEzO8w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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