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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '217326c520122361cc9f9947caa10e4457a0cb5d69450e1d9d2cd7c17b5420a3' 
  AND token = 'faITe3AAvhQEKm2MCRZL+fouFPBSBQfB0twIxYlk6bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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