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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79b4e6bfa3e26558911c2cc5008147d3c41e4e79247591d148c54f4b57072254' 
  AND token = '1sk5f6TdH/VPX/4VGD0boyKH5jLtDdLiAXYpmYEyRpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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