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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1974b4e27841308496d4a82d1a4b34d696a1f0b93c50fd85926fc23ac2e1d9af' 
  AND token = '0G/MDdOsVCjHva3/QoTG14snvHT0VxTKcxl7o5mRGS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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