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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcda7f6c1b62a3622e2e20848b26e708de332320a0db4d0990cab6b7f2f2e2cf' 
  AND token = 'va9XaDz2EIrDWdvAmnfp4XajZd95KxxC/PlBMBZ/lSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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